Pump



June 4, 1940. ASPDEN 7 2,203,646

PUMP

V Filed Feb. 24, 1937 V 2 Sheets-Sheet l 13 8 INVENTOF? Fig.1

. E. w. ASPDEN 2,203,646

- PUMP Filed Feb. 24, 1937 2 Sheets-Sheet 2 QMMM? i malt-.1 June 4,1940 g a 2,203,646

UNITED STATES PATENTOFFICE Application February 24, 1937, Serial No. 127.53

In Great Britain March 7,1936- 1 Claim. (Cl. 103-161) This invention relates to improvements in and the cylinders I. The extent of the movepumps particularly applicable for the hydraulic ,ment of the casing islimited by the stop 6. In transmission of motor vehicles. According to Figs. 1 and 2 the casing 5 is shown in the posithe invention the pump comprises a plurality of tion in which the guides 4 are concentric with 5 radial cylinders and pistons rotating around a the shaft 9 and consequently as the cylinders I 1 central axis forming a master pump, gudgeon and pistons 2 rotate about the shaft there will pins projecting from the pistons and connected be no relative movement between the pistons to follow an eccentric path relatively to the and the. cylinders. cylinders to give the necessary stroke to the Two cylinders 1 and 8 are formed in the V 10 pistons, a non-rotating casing capableof moving casing Ill at diametrically opposite sides of the 10 radially to the axis about which the cylinders sliding casing 5, operating as servo motors. In rotate, a rotary casing, ball races between the each of these cylinders a piston I3 is located rotary casing and the non-rotating casing upon and each piston is connected to the inner casing which the rotary casing rolls, a guideway on 4 by a rod l4. Each of the cylinders l and 8 is the rotary casing in which the ends of the connected by a pipe I and 8 to asmall pump H 16 gudgeon pins are located movement of the H011". through a slide valve H controlled by a governor rotating casing varying the eccentricity of the H The pump B may be driven independently guideway. an outer stationary casing, two diafrom the engine B as by an electric motor or it metrically opposite pistons connected to the nonmaybe geared to the engine cam shaftb.

20 rotating casing, cylinders in the outer stationary As hereinbefore stated the parts are shown in 20 casing in which the pistons are located, a'port Figs. 1 and 2 in position of no eccentricity of the in each cylinder for the supply and release of pistons 2 (which is the position when. the vehicle fluid pressure to move thepistons therein and a is stationary) in which position the cylinder 8 stop on the non-rotating casing engaging a slot is in communication with the pipe 8 and the in the outer stationary casing to prevent the piston l3 in the cylinder is at the inner end of 25 diametrically opposite pistons fromhaving more its stroke and the pipe l is closed i. e. the appathan a predetermined stroke. ratus is shown in the central orneutral position. The invention will be described with refer- The pipe l is closed and the pipe 8 to the ence to the accompanying drawings in which: cylinder 8 is open. Further, movement of the Fig. 1 is a sectional elevation of the master piston [3 in the cylinder 8 to move the casing 5 80' pump. beyond its central position is prevented by the Fig. 2 is a transverse section thereof. stop 6 and the guide ll (Fig. 2) sliding in slots Fig. 3 is a detail view of hollow shaft through in the stationary casing Ill whereby the movewhich liquid is supplied from the master pump ment of the rotary casing 4 in one direction beto the pipe system to the wheel motors. yond its central position is prevented. 85

Fig. 4 is an outside elevation of part of the The engine speed for operating a valve to concasing of the master pump. trol the pipes 1 and'il may be regulated by a The master pump D is a variable stroke oil spring and may be set at say 1000. revolutions per pump and comprises a steel casting D bolted to minute in cases where a quick get away is de- 40 the engine flywheel C and carrying three (or sired. 40 more) radial cylinders l in each of which is a As the engine speed is increased above this piston 2 provided with gudgeon pins 3. The predetermined minimum the valve moves to close ends of the gudgeon pins 3 are located in guides the pipe 8 and cuts ofi the supply of fluid to 4 in a casing 4, preferably of aluminium, and the cylinder 8 which allows the casing 4 to asl the casing D cylinders I, pistons 2 and casing 4 sume an eccentric position with respect to the 45 all rotate around a stationary central shaft 9 stationary casing l0 and the shaft 9 during within a stationary casing 5, ball races 4 being which operation the casing 5 moves downwards provided between the rotating casing 4 and the with the pistons I 3 and the guide II and stop 6 stationary casing 5. The stationary casing 5 travelling in their slots. Further movement of is arranged within an outer casing I0 bolted to the valve opens the pipe I which supplies fluid 50 the casing C of the flywheel C and as formed to the cylinder 1 and forces the piston l3 downwith a guide ll adapted to slide in a slot 12 wards until the guide II and stop 6 are at the in the casing ill to enable the eccentricity of the reverse ends of their slots to that shown in h guides 4 in which the ends of thegudgeon pins Fig. 2. The rotary casing 4 and the guides 4 are located, to be varied relatively tothe shaft 9 for the gudgeon pin 3 will thus become more ec- 55 centric to the cylinders I and as the cylinders rotate about the shaft 9 the gudgeon pins will be constrained to follow an eccentric path. This will give a stroke to the pistons 2 and cause them to draw in oil through the passage Ii which is connected to the pipe 9 from the reservoir G during their outward stroke when the port IS in the passage I5 is uncovered by the bottom of the corresponding cylinder and discharge the oil under pressurethrough the 'passage- H" in the shaft 9 during their inward stroke when the port It in the passage I1 is uncovered by the bot- I the pistons are located, a port in each cylinder tom of the corresponding cylinder.

What I claim as my invention and desire to a protect by Letters Patent is:

A pump comprising a "plurality' 'of radial cylinders and pistons rotating; around ,a central axis forming a master pump, gudgeonapins progive the necessary stroke to the pistons, a nonrotating casing capable of moving radially to the axis about which the cylinders rotate, a rotary casing, ball races between the rotary casing and the non-rotating casing upon which the rotary casing rolls, a guideway on the rotary casing in which the ends of the gudgeon pins are located, movement of the non-rotating casing varying the eccentricity of the guideway, an outer stationary casing; two jdiametricallyf C posite pistons connected 'to the non-rotatingcasing, cylinders in the outer stationary casing in which ior the supply and release of fluid pressure to move the pistons therein and a stop on the nonrotating-casing engaging a slot in the outer stationarycasing to prevent the diametrically oppo- .-site-pistons from having more than a predetermined stroke.

ERNEST WALLACE ASPDEN. 20 

